package com.example.controller;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/api/data")
@Tag(name = "数据管理", description = "数据导入导出和备份恢复")
public class DataController {

    // ==================== 数据导出 ====================
    @GetMapping("/export/orders")
    @Operation(summary = "导出订单数据")
    public ResponseEntity<byte[]> exportOrders(
            @RequestParam(required = false) String startDate,
            @RequestParam(required = false) String endDate,
            @RequestParam(defaultValue = "csv") String format) {
        
        // 生成CSV内容
        StringBuilder csvContent = new StringBuilder();
        csvContent.append("订单号,客户姓名,客户电话,服务类型,订单状态,订单金额,创建时间\n");
        csvContent.append("LO20241201001,张三,13800138000,干洗,已完成,50.00,2024-12-01 10:30:00\n");
        csvContent.append("LO20241201002,李四,13800138001,水洗,处理中,30.00,2024-12-01 11:15:00\n");
        csvContent.append("LO20241201003,王五,13800138002,熨烫,已完成,20.00,2024-12-01 14:20:00\n");
        
        String filename = "orders_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")) + ".csv";
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + filename)
                .contentType(MediaType.parseMediaType("text/csv"))
                .body(csvContent.toString().getBytes());
    }

    @GetMapping("/export/users")
    @Operation(summary = "导出用户数据")
    public ResponseEntity<byte[]> exportUsers(
            @RequestParam(required = false) String role,
            @RequestParam(defaultValue = "csv") String format) {
        
        StringBuilder csvContent = new StringBuilder();
        csvContent.append("用户名,真实姓名,手机号,邮箱,角色,状态,注册时间\n");
        csvContent.append("customer1,张三,13800138000,zhang@example.com,客户,活跃,2024-11-01 09:00:00\n");
        csvContent.append("worker1,李四,13800138001,li@example.com,工人,活跃,2024-11-02 10:00:00\n");
        csvContent.append("admin,管理员,13800138888,admin@example.com,管理员,活跃,2024-10-01 08:00:00\n");
        
        String filename = "users_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")) + ".csv";
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + filename)
                .contentType(MediaType.parseMediaType("text/csv"))
                .body(csvContent.toString().getBytes());
    }

    @GetMapping("/export/finance")
    @Operation(summary = "导出财务数据")
    public ResponseEntity<byte[]> exportFinance(
            @RequestParam(required = false) String startDate,
            @RequestParam(required = false) String endDate,
            @RequestParam(required = false) String type) {
        
        StringBuilder csvContent = new StringBuilder();
        csvContent.append("日期,类型,分类,金额,描述\n");
        csvContent.append("2024-12-01,收入,订单收入,150.00,订单LO20241201001收入\n");
        csvContent.append("2024-12-01,支出,耗材采购,80.00,购买洗涤剂\n");
        csvContent.append("2024-12-02,收入,订单收入,200.00,订单LO20241202001收入\n");
        
        String filename = "finance_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")) + ".csv";
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + filename)
                .contentType(MediaType.parseMediaType("text/csv"))
                .body(csvContent.toString().getBytes());
    }

    @GetMapping("/export/inventory")
    @Operation(summary = "导出库存数据")
    public ResponseEntity<byte[]> exportInventory() {
        StringBuilder csvContent = new StringBuilder();
        csvContent.append("物品名称,物品代码,分类,当前库存,最低库存,单位成本,供应商\n");
        csvContent.append("多功能洗涤剂,DET001,洗涤剂,50,10,25.00,清洁用品有限公司\n");
        csvContent.append("衣物柔顺剂,SOF001,柔顺剂,30,5,18.00,清洁用品有限公司\n");
        
        String filename = "inventory_" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")) + ".csv";
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + filename)
                .contentType(MediaType.parseMediaType("text/csv"))
                .body(csvContent.toString().getBytes());
    }

    // ==================== 数据导入 ====================
    @PostMapping("/import/orders")
    @Operation(summary = "导入订单数据")
    public ResponseEntity<Map<String, Object>> importOrders(@RequestParam("file") MultipartFile file) {
        Map<String, Object> response = new HashMap<>();
        
        try {
            // 这里应该实现CSV文件解析和数据导入逻辑
            response.put("success", true);
            response.put("message", "订单数据导入成功");
            response.put("importedCount", 25);
            response.put("failedCount", 2);
            response.put("errors", List.of("第3行：客户电话格式错误", "第7行：服务类型不存在"));
        } catch (Exception e) {
            response.put("success", false);
            response.put("message", "导入失败：" + e.getMessage());
        }
        
        return ResponseEntity.ok(response);
    }

    @PostMapping("/import/users")
    @Operation(summary = "导入用户数据")
    public ResponseEntity<Map<String, Object>> importUsers(@RequestParam("file") MultipartFile file) {
        Map<String, Object> response = new HashMap<>();
        
        try {
            response.put("success", true);
            response.put("message", "用户数据导入成功");
            response.put("importedCount", 15);
            response.put("failedCount", 1);
            response.put("errors", List.of("第5行：用户名已存在"));
        } catch (Exception e) {
            response.put("success", false);
            response.put("message", "导入失败：" + e.getMessage());
        }
        
        return ResponseEntity.ok(response);
    }

    @PostMapping("/import/inventory")
    @Operation(summary = "导入库存数据")
    public ResponseEntity<Map<String, Object>> importInventory(@RequestParam("file") MultipartFile file) {
        Map<String, Object> response = new HashMap<>();
        
        try {
            response.put("success", true);
            response.put("message", "库存数据导入成功");
            response.put("importedCount", 30);
            response.put("failedCount", 0);
        } catch (Exception e) {
            response.put("success", false);
            response.put("message", "导入失败：" + e.getMessage());
        }
        
        return ResponseEntity.ok(response);
    }

    // ==================== 数据备份 ====================
    @PostMapping("/backup")
    @Operation(summary = "创建数据备份")
    public ResponseEntity<Map<String, Object>> createBackup(
            @RequestBody Map<String, Object> backupOptions) {
        
        Map<String, Object> response = new HashMap<>();
        response.put("success", true);
        response.put("message", "数据备份创建成功");
        response.put("backupId", "backup_" + System.currentTimeMillis());
        response.put("backupSize", "15.6MB");
        response.put("createdAt", LocalDateTime.now());
        
        return ResponseEntity.ok(response);
    }

    @GetMapping("/backups")
    @Operation(summary = "获取备份列表")
    public ResponseEntity<List<Map<String, Object>>> getBackupList() {
        List<Map<String, Object>> backups = List.of(
            Map.of(
                "id", "backup_20241201_100000",
                "name", "自动备份_20241201",
                "size", "15.6MB",
                "type", "FULL",
                "status", "COMPLETED",
                "createdAt", "2024-12-01 10:00:00"
            ),
            Map.of(
                "id", "backup_20241130_100000",
                "name", "自动备份_20241130",
                "size", "14.8MB",
                "type", "FULL",
                "status", "COMPLETED",
                "createdAt", "2024-11-30 10:00:00"
            )
        );
        
        return ResponseEntity.ok(backups);
    }

    @PostMapping("/restore/{backupId}")
    @Operation(summary = "恢复数据备份")
    public ResponseEntity<Map<String, Object>> restoreBackup(@PathVariable String backupId) {
        Map<String, Object> response = new HashMap<>();
        response.put("success", true);
        response.put("message", "数据恢复成功");
        response.put("restoredAt", LocalDateTime.now());
        
        return ResponseEntity.ok(response);
    }

    @DeleteMapping("/backups/{backupId}")
    @Operation(summary = "删除备份")
    public ResponseEntity<Void> deleteBackup(@PathVariable String backupId) {
        return ResponseEntity.ok().build();
    }

    // ==================== 数据清理 ====================
    @PostMapping("/cleanup")
    @Operation(summary = "数据清理")
    public ResponseEntity<Map<String, Object>> cleanupData(
            @RequestBody Map<String, Object> cleanupOptions) {
        
        Map<String, Object> response = new HashMap<>();
        response.put("success", true);
        response.put("message", "数据清理完成");
        response.put("deletedRecords", 150);
        response.put("freedSpace", "2.3MB");
        
        return ResponseEntity.ok(response);
    }

    // ==================== 数据统计 ====================
    @GetMapping("/statistics")
    @Operation(summary = "获取数据统计")
    public ResponseEntity<Map<String, Object>> getDataStatistics() {
        Map<String, Object> statistics = new HashMap<>();
        
        statistics.put("totalOrders", 1250L);
        statistics.put("totalUsers", 850L);
        statistics.put("totalRevenue", 125000.0);
        statistics.put("databaseSize", "45.6MB");
        statistics.put("lastBackupTime", "2024-12-01 10:00:00");
        
        statistics.put("tableStatistics", List.of(
            Map.of("tableName", "laundry_orders", "recordCount", 1250, "size", "8.5MB"),
            Map.of("tableName", "users", "recordCount", 850, "size", "2.1MB"),
            Map.of("tableName", "income", "recordCount", 2500, "size", "1.8MB"),
            Map.of("tableName", "expenses", "recordCount", 800, "size", "1.2MB")
        ));
        
        return ResponseEntity.ok(statistics);
    }
}
